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Viewing changes to external/xwt/Xwt.WPF/Xwt.WPFBackend/CanvasBackend.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
ImportĀ upstreamĀ versionĀ 4.0.5+dfsg

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external/xwt/Xwt.WPF/Xwt.WPFBackend/CanvasBackend.cs
 
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ļ»æ//
 
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// CanvasBackend.cs
 
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//
 
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// Author:
 
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//       Eric Maupin <ermau@xamarin.com>
 
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//
 
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// Copyright (c) 2012 Xamarin, Inc.
 
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//
 
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// Permission is hereby granted, free of charge, to any person obtaining a copy
 
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// of this software and associated documentation files (the "Software"), to deal
 
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// in the Software without restriction, including without limitation the rights
 
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 
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// copies of the Software, and to permit persons to whom the Software is
 
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// furnished to do so, subject to the following conditions:
 
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//
 
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// The above copyright notice and this permission notice shall be included in
 
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// all copies or substantial portions of the Software.
 
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//
 
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 
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// THE SOFTWARE.
 
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using System;
 
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using System.Collections.Generic;
 
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using System.Drawing;
 
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using System.Windows;
 
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using System.Windows.Media;
 
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using System.Windows.Media.Imaging;
 
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using Xwt.Engine;
 
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using SWC = System.Windows.Controls;
 
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using Xwt.Backends;
 
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using PixelFormat = System.Drawing.Imaging.PixelFormat;
 
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namespace Xwt.WPFBackend
 
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{
 
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        public class CanvasBackend
 
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                : WidgetBackend, ICanvasBackend
 
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        {
 
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                public CanvasBackend ()
 
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                {
 
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                        Canvas = new ExCanvas();
 
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                        Canvas.Render += OnRender;
 
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                        this.image = new SWC.Image();
 
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                        SWC.Panel.SetZIndex (this.image, -1);
 
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                        Canvas.Children.Add (this.image);
 
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                }
 
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                public void QueueDraw()
 
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                {
 
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                        this.fullRedraw = true;
 
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                        if (!this.queued) {
 
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                            Toolkit.QueueExitAction (Render);
 
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                            this.queued = true;
 
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                        }
 
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                }
 
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                public void QueueDraw (Rectangle rect)
 
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                {
 
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                        if (this.fullRedraw)
 
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                                return;
 
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                        this.dirtyRects.Add (rect.ToInt32Rect());
 
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                        if (!this.queued) {
 
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                            Toolkit.QueueExitAction (Render);
 
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                            this.queued = true;
 
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                        }
 
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                }
 
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                public void AddChild (IWidgetBackend widget, Rectangle bounds)
 
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                {
 
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                        UIElement element = widget.NativeWidget as UIElement;
 
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                        if (element == null)
 
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                                throw new ArgumentException();
 
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                        if (!Canvas.Children.Contains (element))
 
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                                Canvas.Children.Add (element);
 
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                        SetChildBounds (widget, bounds);
 
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                }
 
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                public void SetChildBounds (IWidgetBackend widget, Rectangle bounds)
 
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                {
 
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                        FrameworkElement element = widget.NativeWidget as FrameworkElement;
 
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                        if (element == null)
 
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                                throw new ArgumentException();
 
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                        double hratio = HeightPixelRatio;
 
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                        double wratio = WidthPixelRatio;
 
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                        SWC.Canvas.SetTop (element, bounds.Top * hratio);
 
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                        SWC.Canvas.SetLeft (element, bounds.Left * wratio);
 
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                        // We substract the widget margin here because the size we are assigning is the actual size, not including the WPF marings
 
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                        var h = bounds.Height - ((WidgetBackend)widget).Frontend.Margin.VerticalSpacing;
 
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                        var w = bounds.Width - ((WidgetBackend)widget).Frontend.Margin.HorizontalSpacing;
 
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                        element.Height = (h > 0) ? h * hratio : 0;
 
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                        element.Width = (w > 0) ? w * wratio : 0;
 
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                        ((FrameworkElement) widget.NativeWidget).UpdateLayout();
 
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                }
 
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                public void RemoveChild (IWidgetBackend widget)
 
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                {
 
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                        UIElement element = widget.NativeWidget as UIElement;
 
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                        if (element == null)
 
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                                throw new ArgumentException();
 
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                        Canvas.Children.Remove (element);
 
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                }
 
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                private bool queued;
 
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                private bool fullRedraw;
 
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                private readonly SWC.Image image;
 
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                private WriteableBitmap wbitmap;
 
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                private Bitmap bbitmap;
 
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                private readonly List<Int32Rect> dirtyRects = new List<Int32Rect> ();
 
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                private double pwidth = -1;
 
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                private double pheight = -1;
 
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                private ExCanvas Canvas
 
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                {
 
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                        get { return (ExCanvas) Widget; }
 
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                        set { Widget = value; }
 
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                }
 
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                private ICanvasEventSink CanvasEventSink
 
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                {
 
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                        get { return (ICanvasEventSink) EventSink; }
 
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                }
 
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                private void OnRender (object sender, EventArgs e)
 
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                {
 
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                        Render();
 
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                }
 
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                private void Render()
 
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                {
 
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                        this.queued = false;
 
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                        if (!Widget.IsVisible)
 
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                                return;
 
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                        if (Canvas.ActualHeight != this.pheight || Canvas.ActualWidth != this.pwidth)
 
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                        {
 
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                                double heightRatio = HeightPixelRatio;
 
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                                double widthRatio = WidthPixelRatio;
 
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                                int nheight = (int) Math.Round (Canvas.ActualHeight * heightRatio) + 1;
 
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                                int nwidth = (int) Math.Round (Canvas.ActualWidth * widthRatio) + 1;
 
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                                if (nheight == 0 || nwidth == 0)
 
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                                        return;
 
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                                this.wbitmap = new WriteableBitmap (nwidth, nheight, widthRatio * 96, heightRatio * 96, PixelFormats.Pbgra32, null);
 
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                                this.bbitmap = new Bitmap (nwidth, nheight, this.wbitmap.BackBufferStride, PixelFormat.Format32bppPArgb, this.wbitmap.BackBuffer);
 
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                                this.image.Source = this.wbitmap;
 
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                                this.pheight = Canvas.ActualHeight;
 
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                                this.pwidth = Canvas.ActualWidth;
 
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                        }
 
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                        this.wbitmap.Lock();
 
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                        using (Graphics g = Graphics.FromImage (this.bbitmap))
 
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                                CanvasEventSink.OnDraw (new DrawingContext (g), new Rectangle (0, 0, this.wbitmap.PixelWidth, this.wbitmap.PixelHeight));
 
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                        if (this.fullRedraw || this.dirtyRects.Count == 0) {
 
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                                this.wbitmap.AddDirtyRect (new Int32Rect (0, 0, this.wbitmap.PixelWidth, this.wbitmap.PixelHeight));
 
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                                this.fullRedraw = false;
 
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                        } else {
 
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                                for (int i = 0; i < this.dirtyRects.Count; ++i) {
 
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                                        Int32Rect r = this.dirtyRects [i];
 
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                                        if (r.X >= this.wbitmap.PixelWidth || r.Y >= this.wbitmap.PixelHeight)
 
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                                                continue;
 
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                                        if (r.X < 0)
 
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                                                r.X = 0;
 
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                                        if (r.Y < 0)
 
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                                                r.Y = 0;
 
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                                        if (r.X + r.Width > this.wbitmap.PixelWidth)
 
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                                                r.Width = this.wbitmap.PixelWidth - r.X;
 
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                                        if (r.Y + r.Height > this.wbitmap.PixelHeight)
 
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                                                r.Height = this.wbitmap.PixelHeight - r.Y;
 
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                                        this.wbitmap.AddDirtyRect (r);
 
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                                }
 
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                        }
 
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                        this.dirtyRects.Clear();
 
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                        this.wbitmap.Unlock();
 
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                }
 
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        }
 
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}
 
 
b'\\ No newline at end of file'